Screen apparatus for paper-pulp.



\ No. 694,678. Patented Mar. 4, I902,

D. SHARPE. SCREEN APPARATUS FOR PAPER PULP.

(Application filed Sept. 24, 1901.)

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No. 694,678. Patented Mar. 4, I902.

D. SHARPE.

SCREEN APPARATUS FOR PAPER PULP.

(Application filed Sept. 24. 1901.)

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Patented Mar. 4, I902.

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(Application filed Sept. 24, 1901.)

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UNITED STATES PATENT Onrrcn.

DAVID SHARPE, OF SOUTH HADLEY FALLS, MASSACHUSETTS.

SCREEN APPARATUS FOR PAPER-PULP.

SPEOIFIOATIQN forming part of Letters Patent No. 694,678, dated March 4,1902. Application filed September 24,1901. Serial No. 76,340. (No man.)

To all whom it: may clot 203770; 7 Be it known that 1, DAVI SHAnPE, asubject ofthe King of Great Britain, and a resident of South HadleyFalls, in the county of Hampden and State of I Massachusetts, haveinvented certain new and useful Improve ments in Screen Apparatus forPaper-Pulp, of which thefollowing is a full, clear,and exactdescription.

This invention relates to improvements in strainer-screens forpaper-pulp, the object being to provide an improved apparatus forseparating from the pulp which has been brought into the strainingapparatus from the engine dirt and other foreign matter or sub stanceswhich may be found in the pulp and which should be extracted before thepulp is supplied to the paper-machine.

The improvements above generally referred to more particularly consistin improved means for operating the diaphragm which imparts a suction inthe box or vat beneath the strainer bed or screen, for changing thelength of the working play or stroke ofthe diaphragm, and for varyingthe speed of the reciprocation of the diaphragm. V

The improvements further consist in the construction and arrangement ofthe strainer bed or screen in the apparatus, whereby the capacity andefficiency is increased, in provisions for automatically andperiodically clearing the screen of the residue or foreign matterwithheld from the strained pulp, and in the arrangement ofthe trough orconduit for taking the pulp off from the diaphragm which constitutes themovable bottom of the vator box.

To these ends the invention consists in the apparatus as hereinafterdescribed and in constructions and arrangements of certain of the partsthereof, all as hereinafter pointed out, and set forth in the claims.

The improved strainer-screen for paperpulp is illustrated in theaccompanying drawings, in which Figure 1 is a plan view, a portion ofthe strainer bed or screen being broken away, showing the portion of thediaphragm which constitutes the movable bottom of the vat, and portionsof the vat and trough or serviceconduit being shown in horizontalsection. Fig. 2 is a vertical longitudinal sectional view on line 2 2,Fig. 1. Fig. 3 is a vertical cross-sectional view on line 3 3, Fig. 2.

I Similar characters of reference indicate corresponding features in all'of the views.

In the drawings, A represents the box or vat of a suitable 'size andform, preferably rectangular, open atthe top and having the 7 bottomthereof constituted principally by the diaphragm B, which works freelywithin the surrounding internal horizontal flange or base-ledge a. ThediaphragmB is joined to the said base-ledge a by the band or gasket 19,which may be of rubber, rubber-cloth,

leather, or any other suitable flexible lnaterial, said gasket beingfirmly and closely united to the ledge a and marginal portions ing theirlocations above and suitably separated from the diaphragm. The screen 0at the one side is separated from the screen D at the other sideby thelongitudinal partition or .lnidbridge E. The screen 0 is inclineddownwardly fromthe right-hand toward the lefthand end of the apparatus,as viewed in Figs.

1 and-2, and the screen D is inclined from its left-hand end downwardlyrightward, the lower end of the first screen reaching a'level adjacentthat of the higher end of the second screen, and communication at theleft-hand end of the apparatus from the low end of the first screen tothe high end of the second screen is had through the aperture din themidbridge. The longitudinal vertical side walls of the vat and themid-bridge are provided with ledges e, which are inclined correspondingto the desired inclinations of the strainerscreens 0 and D and uponwhich the latter are supported. The strainer-screens have the slits f,which are downwardly widened, as usual in this class of apparatus.

F represents the pulp-supply conduit for bringing the pulp fromthe'engine onto the screen 0.

The diaphragm has the two sets of depend= in g ear-lugs g, below whichat the base for the machine are the upstanding ear-lugs g pivotallyconnected to both sets of which earlugs are the toggle-bars h it, bothof the sets of toggles being united by the link t, and this double-linkunited toggle mechanism has the engagement therewith of theconnecting-rod j, one end of which is secured to the crankstud providedin the disk or face-plate m. The said disk or face-plate is slotted,receiving within the slot a block n, which carries stud k, which isscrew-engaged by the screwshaft 0, mounted to turn without endwisemotion in bearings therefor in the face-plate, all so that the pivotalpoint 7c may be nearer or farther from the center of the face-plate tovary the extent of the toggle action, and thereby the length of theworking play for the diaphragm,the downward motion of which brings thepulp by suction down through the strainer-beds C and D. The face-platem, of which the adjustable crank-pin k is an adjunct, is mounted on theshaft G in bearings in the supporting-framing H, which is locatedadjacent the end of the vat. Said shaft G has thereon the cone-pulley J,above which is another cone-pulley K, the beltN running around both saidcone-pulleys and driving the one J from the one K, the latter being onthe driving-shaft M, provided with the driving-pulley M While stepspeed-cones K and J areshown in the drawings, axially parallel andreversely-tapered speed-changing cones may be substituted therefor aswell known equivalents.

In addition to the capability of changing the extent of working play ofthe suction-diaphragm, as insured by the adjustability of the crank-pin,the shifting of the belt N in the line of the axes of the cone-pulleys Jand K insures, as may be desired, a variation in the frequency ofreciprocations of the diaphragm. The diaphragm has the dependingpolygonal stud 1), playing through the correspondingly-apertured hub qfor guidance and the steadying of'the diaphragm in its motions, the saidapertured hub (1 being supported on the cross-bar g which is secured tothe base of the vat. The chamber beneath the strainer-bed, of which thediaphragm substantially constitutes the bottom, has the top wall thereofconstituted by the inclined screens 0 and D, and in order to equalizethe vacuum, so tha-t'the suction will be uniform under all portions ofthe screens, the diaphragm B is built up with the inclined blocks orplates .9.

The mid-bridgeE has a space r between its lower edge and the diaphragmtop, so that the pulp which has been strained through the screen 0 maypass or flow laterally under the screen D, from which portion of the vatit passes by way of the aperturest t in the side of the vat into thetrough O, which is provided at three sides of the vat, and is continuedin the conduits 0 into the head-box P, from which it is delivered in theusual manner onto the paper-machine. The dirt and foreign matterretained at the top of the screens finally gravitates to the lower endof the second screen D, at the right-hand end of and near one side ofthe vat, whereat there is an outlet-opening it, normally closed by thegate c. This gate is periodically raised, (for instance, once every fewminutes,) and as means to this end the gate is engaged at the offset lug44 at the upper portion thereof, by the tappet r on the disk c, which ismounted for a slow rotation on the shaft 12 the large end of the cone 0thereof carrying the belt c which is driven by its frictional engagementon the small end of the cone c on the driving-shaft M. Concurrentlywiththe raising of the gate a Water-flush is given near the aforesaidopeningu within the vat in a direction to wash out the dirt, 8:0. whichhas gravitated to this place, and this is automatically insured byproviding the flushing or sprinkler pipe 20, which is located justwithin the gate, and having the lever extension 00 of the stem of saidcock extended for engagement between upper and lower studs g, which areextended inwardly from the gate, all so that the movements of the gateinsure in cooperation therewith the opening and closingof the cock,permitting and shutting off the water-flushes in the sprinkler-pipe.

While I have shown the vat divided-by the mid-bridge E and two screensoppositely inclined at either side of the mid-bridge, with a port oraperture leading from the space above the one screen near its low end tothe high end of the second screen, I do not necessarily limit myself tothis arrangement, although I regard it as highly preferable, for I mayconstruct the strainer apparatus within the scope of this invention andthe terms of my claims without following this specified arrangement.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. In a screen apparatus for paper-pulp, the screen-box having abase-formingdiaphragm, toggles below and engaged with the diaphragm, andlinked together, a driving-shaft and a counter-shaft havingcone-pulleys, a driving-belt around said pulleys,an ape'rtured faceplateon the counter-shaft, an ad-j ustable block in the apertured face-plate,with an adjusting-so rew therefor, a crank-pin carried by said block,and a connecting-rod secured to the crank-pin, and to the linkedtoggles. I I

2. In a screen apparatus, the box having an inclined screen therein, anditsbase constituted by a horizontal reciprocatory 'diaphragm, the top ofwhich'has a section 3, the upper surface of which is inclined substautially corresponding to the inclination of the screen, for equalizingthe suction action.

3. In a screen apparatus for paper-pulp, the box having thediaphragm-base, and a screen thereabove which is inclined, an outlet forthe pulp leading from the box below the screen and an outlet for theextraneous matter leading from the box adjacent the top of the lowerportion of the screen, a gate for said latter outlet, and means forautomatically periodically opening the same, and means for clearing theextraneous matter on the lower por- IIC tion of the screen adjacent thegate-provided opening through the latter. I

4. In a screen apparatus for paper-pulp, the box having thediaphragm-base, and a screen thereabovewhich is' inclined, anoiitlet"for the pulp leading from the box below the screen and anvoutlet for the extraneous matter leading from the box adjacent the topof the lower portion of the screen, a gate for said latter outlet havinga projection c and a rotating part having a tappet, periodicallyengaging the projection. r

5. In a screen apparatus for paper-pulp, the box having thediaphragm-base, and a screen thereabove which is inclined, an outlet forthe pulp leading from the box below the screen and an ,outlet for theextraneous matter leading from the box adjacent, the top of the lowerportion ofthe screen, a gate. for said latter outlet, and means forautomatically periodically opening the sam e,a sprinkler-pipe above thescreen adjacent the gate-provided opening having a shut-oiffcock, andmeansoperating concurrently with the opening and closing of the gate foropening and closing the said cock., 7

6. In a screen apparatus for paper-pulp, the box having thediaphragm-base, and a screen thereabove which is inclined, an outlet forthe pulp leading from the box below thescreen and an outlet for theextraneousmatterlead ing from the box adjacent the top of the lowerportionof the screen, a gate for said latter outlet, and means forautomatically periodically opening the same, a sprinkler-pipe above thescreen adjacent the gate-provided. opening having ashut-off cock, havingon itsstem,

, a lever-handle, and projections extended from the gate and engagingthe lever-handle of the cock, substantially as described.

7. Inascreen apparatus for paper-pulp, the box having itsbaseiconstituted bya reciprocatory diaphragm, and having therewithin thelongitudinal partition E, a screen above the diaphragm at one side ofsaid partition inclining from one end downwardly toward the other,another screen at the other side of the partition having its high endinclining from about the level of the low end of the first screendownwardly in the, opposite direction, the said partition having theaperture (1, one or more outlet-openings forrthe pulp leading from thebox below the screen, and an outlet-opening leadingfrom e box adjacentthe lower end of the second screen, and means for closing the latteropening.

8. In a screen apparatus for paper-pulp, the box having its baseconstituted by a reciprocatory diaphragm, and having therewithin thelongitudinal partition E, a screen above the diaphragm at one side ofsaid partition inclining from one end downwardly toward the other,another screen at the other side of the partition having its high endinclining from about the level of the low end of the first screendownwardly in the opposite direction,the said partition having theaperture (i, one or more outlet-openings for the pulp leading from thelower portion of the box at the side thereof of the second inclinedscreen, the trough O, inclosing three sides of the box, the head-box andthe conduits connecting the trough therewith.

v 9. In a screen apparatus for paper-pulp, the

box having itsbase constituted by a reciprocatorydiaphragm and havingtherewithin the longitudinal partition E, a screen 0 above the diaphragmatone side of said partition, incliningv endwise downwardly, another,screen atthe opposite sideof the partition inclining in theoppositedirection from, and located at a lower level than the first screen, saidpartition having an aperture at one end portion, above said screens,saiddiaphragm being constructed withfreversely-inclined built-up por= tionssi s at opposite halves thereof, substantially as and for the purposesset forth.

10. In a screen apparatus, the combination with the box having aninclined screen and thediaphragm-base, andprovided with a pulpdischargingaperturebelow the screen, and a waste-clearingapertureadjacent the top surface of the screen having a gate, of thetoggles ,below and connected .to the diaphragm and linked together, theshaftM and counter- -shaft Gha'ving cone-pulleys and connectingbelt, andsaid shaft G having crank 7c, theirod connecting said crank and saidlinked toggles, and the shaft 10 driven from said shaft M having thetappet c cooperatin g with thegate.

11. In a pulp-screening apparatus, the box or vat having on its oppositeinner side walls,

the ledges e at dilferentiheights and. oppositelyinclinin g and theintermediate longitu dinal partition E having on its opposite sidesinclined ledges opposite and parallel .with those. of the box-wall, thescreens 0 and D on said ledges, the diaphragm constituting the base ofthe box, and means for operating the diaphragm. i

Signed by me at Springfield, Massachusetts, this2lst day of September,1901.

DAVID SHARPE. Witnesses; i

WM.1S. BnLLows, M. A. CAMPBELL.

